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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 24 |
| 7 | 480 |
| 8 | 5984 |
| 9 | 57640 |
| 10 | 470504 |
| 11 | 3426320 |
| 12 | 22979920 |
| 13 | 144970904 |
| 14 | 872919960 |
| 15 | 5069777856 |
| 16 | 28621255872 |
| 17 | 157982891656 |
| 18 | 856443633608 |
| 19 | 4575819838960 |
| 20 | 24160867451824 |
| 21 | 126350618774264 |
| 22 | 655576175021944 |
| 23 | 3379581924222624 |
| 24 | 17329834154541600 |
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